Home / 20,858.76-28,785.24-11,428.20

Finding the Fourth Proportional to 20,858.76, 28,785.24 and 11,428.20

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Solution

The fourth proportional to 20,858.76, 28,785.24 and 11,428.20 is: 15,771.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.76 : 28,785.24 = 11,428.20 : x
  2. Step 2: Convert to fraction form
    20,858.76/28,785.24 = 11,428.20/x
  3. Step 3: Cross multiply
    20,858.76x = 28,785.24 × 11,428.20
  4. Step 4: Simplify right side
    20,858.76x = 328,963,479.77
  5. Step 5: Solve for x
    x = 328,963,479.77/20,858.76
  6. Step 6: Final answer
    x = 15,771.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.